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    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
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<body>
    <script>
        // 1.遍历数据，直接遍历
        let arr = ['红烧茄子', '葱爆牛肉', 44, true];
        console.log(arr[0]);
        console.log(arr[1]);
        console.log(arr[2]);
        console.log(arr[3]);

        console.log(arr);
        console.log('数组的长度为：' + arr.length);

        // 2.for循环，遍历索引号
        for(let i = 0;i<4; i++){
            console.log(arr[i]);
        }

        // 3.数组的长度作为计时器

        for (let i = arr.length - 1; i >= 0; i--) {
            let sum = '';
            for (let j = 0; j <= i; j++) {
                sum = arr[i] + '  ' + sum;
            }
            console.log(sum);
        }

    </script>
</body>
</html>